diff --git a/transport/internet/config.go b/transport/internet/config.go
index 83f09754..e665da8b 100644
--- a/transport/internet/config.go
+++ b/transport/internet/config.go
@@ -5,22 +5,59 @@ import "v2ray.com/core/common/serial"
 type ConfigCreator func() interface{}
 
 var (
-	globalTransportConfigCreatorCache = make(map[TransportProtocol]ConfigCreator)
+	globalTransportConfigCreatorCache = make(map[string]ConfigCreator)
 	globalTransportSettings           []*TransportConfig
 )
 
+const unknownProtocol = "unknown"
+
+func transportProtocolToString(protocol TransportProtocol) string {
+	switch protocol {
+	case TransportProtocol_TCP:
+		return "tcp"
+	case TransportProtocol_UDP:
+		return "udp"
+	case TransportProtocol_HTTP:
+		return "http"
+	case TransportProtocol_MKCP:
+		return "mkcp"
+	case TransportProtocol_WebSocket:
+		return "websocket"
+	case TransportProtocol_DomainSocket:
+		return "domainsocket"
+	default:
+		return unknownProtocol
+	}
+}
+
 func RegisterProtocolConfigCreator(protocol TransportProtocol, creator ConfigCreator) error {
-	if _, found := globalTransportConfigCreatorCache[protocol]; found {
-		return newError("protocol ", TransportProtocol_name[int32(protocol)], " is already registered").AtError()
+	name := transportProtocolToString(protocol)
+	if name == unknownProtocol {
+		return newError("protocol ", TransportProtocol_name[int32(protocol)], " is not supported").AtError()
 	}
-	globalTransportConfigCreatorCache[protocol] = creator
+	return RegisterProtocolConfigCreatorByName(name, creator)
+}
+
+func RegisterProtocolConfigCreatorByName(name string, creator ConfigCreator) error {
+	if _, found := globalTransportConfigCreatorCache[name]; found {
+		return newError("protocol ", name, " is already registered").AtError()
+	}
+	globalTransportConfigCreatorCache[name] = creator
 	return nil
 }
 
 func CreateTransportConfig(protocol TransportProtocol) (interface{}, error) {
-	creator, ok := globalTransportConfigCreatorCache[protocol]
+	name := transportProtocolToString(protocol)
+	if name == unknownProtocol {
+		return nil, newError("protocol ", TransportProtocol_name[int32(protocol)], " is not supported").AtError()
+	}
+	return CreateTransportConfigByName(name)
+}
+
+func CreateTransportConfigByName(name string) (interface{}, error) {
+	creator, ok := globalTransportConfigCreatorCache[name]
 	if !ok {
-		return nil, newError("unknown transport protocol: ", protocol)
+		return nil, newError("unknown transport protocol: ", name)
 	}
 	return creator(), nil
 }
@@ -29,48 +66,47 @@ func (c *TransportConfig) GetTypedSettings() (interface{}, error) {
 	return c.Settings.GetInstance()
 }
 
-func (c *StreamConfig) GetEffectiveProtocol() TransportProtocol {
-	if c == nil {
-		return TransportProtocol_TCP
+func (c *TransportConfig) GetUnifiedProtocolName() string {
+	if len(c.ProtocolName) > 0 {
+		return c.ProtocolName
 	}
-	return c.Protocol
-}
 
-func (c *StreamConfig) GetEffectiveTransportSettings() (interface{}, error) {
-	protocol := c.GetEffectiveProtocol()
+	return transportProtocolToString(c.Protocol)
+}
 
-	if c != nil {
-		for _, settings := range c.TransportSettings {
-			if settings.Protocol == protocol {
-				return settings.GetTypedSettings()
-			}
-		}
+func (c *StreamConfig) GetEffectiveProtocol() string {
+	if c == nil {
+		return "tcp"
 	}
 
-	for _, settings := range globalTransportSettings {
-		if settings.Protocol == protocol {
-			return settings.GetTypedSettings()
-		}
+	if len(c.ProtocolName) > 0 {
+		return c.ProtocolName
 	}
-	return CreateTransportConfig(protocol)
+
+	return transportProtocolToString(c.Protocol)
+}
+
+func (c *StreamConfig) GetEffectiveTransportSettings() (interface{}, error) {
+	protocol := c.GetEffectiveProtocol()
+	return c.GetTransportSettingsFor(protocol)
 }
 
-func (c *StreamConfig) GetTransportSettingsFor(protocol TransportProtocol) (interface{}, error) {
+func (c *StreamConfig) GetTransportSettingsFor(protocol string) (interface{}, error) {
 	if c != nil {
 		for _, settings := range c.TransportSettings {
-			if settings.Protocol == protocol {
+			if settings.GetUnifiedProtocolName() == protocol {
 				return settings.GetTypedSettings()
 			}
 		}
 	}
 
 	for _, settings := range globalTransportSettings {
-		if settings.Protocol == protocol {
+		if settings.GetUnifiedProtocolName() == protocol {
 			return settings.GetTypedSettings()
 		}
 	}
 
-	return CreateTransportConfig(protocol)
+	return CreateTransportConfigByName(protocol)
 }
 
 func (c *StreamConfig) GetEffectiveSecuritySettings() (interface{}, error) {
diff --git a/transport/internet/config.pb.go b/transport/internet/config.pb.go
index ce8a063c..77027296 100644
--- a/transport/internet/config.pb.go
+++ b/transport/internet/config.pb.go
@@ -48,12 +48,15 @@ func (x TransportProtocol) String() string {
 	return proto.EnumName(TransportProtocol_name, int32(x))
 }
 func (TransportProtocol) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_config_027b4c7f353c31be, []int{0}
+	return fileDescriptor_config_59931ebeb80dc13e, []int{0}
 }
 
 type TransportConfig struct {
 	// Type of network that this settings supports.
+	// Deprecated. Use the string form below.
 	Protocol TransportProtocol `protobuf:"varint,1,opt,name=protocol,proto3,enum=v2ray.core.transport.internet.TransportProtocol" json:"protocol,omitempty"`
+	// Type of network that this settings supports.
+	ProtocolName string `protobuf:"bytes,3,opt,name=protocol_name,json=protocolName,proto3" json:"protocol_name,omitempty"`
 	// Specific settings. Must be of the transports.
 	Settings             *serial.TypedMessage `protobuf:"bytes,2,opt,name=settings,proto3" json:"settings,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}             `json:"-"`
@@ -65,7 +68,7 @@ func (m *TransportConfig) Reset()         { *m = TransportConfig{} }
 func (m *TransportConfig) String() string { return proto.CompactTextString(m) }
 func (*TransportConfig) ProtoMessage()    {}
 func (*TransportConfig) Descriptor() ([]byte, []int) {
-	return fileDescriptor_config_027b4c7f353c31be, []int{0}
+	return fileDescriptor_config_59931ebeb80dc13e, []int{0}
 }
 func (m *TransportConfig) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_TransportConfig.Unmarshal(m, b)
@@ -92,6 +95,13 @@ func (m *TransportConfig) GetProtocol() TransportProtocol {
 	return TransportProtocol_TCP
 }
 
+func (m *TransportConfig) GetProtocolName() string {
+	if m != nil {
+		return m.ProtocolName
+	}
+	return ""
+}
+
 func (m *TransportConfig) GetSettings() *serial.TypedMessage {
 	if m != nil {
 		return m.Settings
@@ -100,8 +110,10 @@ func (m *TransportConfig) GetSettings() *serial.TypedMessage {
 }
 
 type StreamConfig struct {
+	// Effective network. Deprecated. Use the string form below.
+	Protocol TransportProtocol `protobuf:"varint,1,opt,name=protocol,proto3,enum=v2ray.core.transport.internet.TransportProtocol" json:"protocol,omitempty"` // Deprecated: Do not use.
 	// Effective network.
-	Protocol          TransportProtocol  `protobuf:"varint,1,opt,name=protocol,proto3,enum=v2ray.core.transport.internet.TransportProtocol" json:"protocol,omitempty"`
+	ProtocolName      string             `protobuf:"bytes,5,opt,name=protocol_name,json=protocolName,proto3" json:"protocol_name,omitempty"`
 	TransportSettings []*TransportConfig `protobuf:"bytes,2,rep,name=transport_settings,json=transportSettings,proto3" json:"transport_settings,omitempty"`
 	// Type of security. Must be a message name of the settings proto.
 	SecurityType string `protobuf:"bytes,3,opt,name=security_type,json=securityType,proto3" json:"security_type,omitempty"`
@@ -116,7 +128,7 @@ func (m *StreamConfig) Reset()         { *m = StreamConfig{} }
 func (m *StreamConfig) String() string { return proto.CompactTextString(m) }
 func (*StreamConfig) ProtoMessage()    {}
 func (*StreamConfig) Descriptor() ([]byte, []int) {
-	return fileDescriptor_config_027b4c7f353c31be, []int{1}
+	return fileDescriptor_config_59931ebeb80dc13e, []int{1}
 }
 func (m *StreamConfig) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_StreamConfig.Unmarshal(m, b)
@@ -136,6 +148,7 @@ func (m *StreamConfig) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_StreamConfig proto.InternalMessageInfo
 
+// Deprecated: Do not use.
 func (m *StreamConfig) GetProtocol() TransportProtocol {
 	if m != nil {
 		return m.Protocol
@@ -143,6 +156,13 @@ func (m *StreamConfig) GetProtocol() TransportProtocol {
 	return TransportProtocol_TCP
 }
 
+func (m *StreamConfig) GetProtocolName() string {
+	if m != nil {
+		return m.ProtocolName
+	}
+	return ""
+}
+
 func (m *StreamConfig) GetTransportSettings() []*TransportConfig {
 	if m != nil {
 		return m.TransportSettings
@@ -175,7 +195,7 @@ func (m *ProxyConfig) Reset()         { *m = ProxyConfig{} }
 func (m *ProxyConfig) String() string { return proto.CompactTextString(m) }
 func (*ProxyConfig) ProtoMessage()    {}
 func (*ProxyConfig) Descriptor() ([]byte, []int) {
-	return fileDescriptor_config_027b4c7f353c31be, []int{2}
+	return fileDescriptor_config_59931ebeb80dc13e, []int{2}
 }
 func (m *ProxyConfig) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ProxyConfig.Unmarshal(m, b)
@@ -210,34 +230,36 @@ func init() {
 }
 
 func init() {
-	proto.RegisterFile("v2ray.com/core/transport/internet/config.proto", fileDescriptor_config_027b4c7f353c31be)
-}
-
-var fileDescriptor_config_027b4c7f353c31be = []byte{
-	// 393 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xb4, 0x91, 0xcf, 0x6a, 0xdb, 0x40,
-	0x10, 0x87, 0x2b, 0xc9, 0x6d, 0xe5, 0xb1, 0xdd, 0xae, 0xf7, 0x64, 0x0a, 0xa6, 0xae, 0x0b, 0x45,
-	0xf4, 0xb0, 0x32, 0xea, 0x1b, 0x58, 0x3e, 0xb4, 0xb4, 0xa6, 0x42, 0x52, 0x5b, 0x30, 0x14, 0xb3,
-	0xde, 0x6c, 0x84, 0x88, 0xa5, 0x35, 0xab, 0x4d, 0x88, 0x9e, 0x27, 0xb7, 0xdc, 0xf3, 0x7e, 0x41,
-	0xff, 0x16, 0x93, 0x80, 0xf1, 0x25, 0xb7, 0x41, 0xf3, 0x9b, 0x6f, 0x3e, 0xcd, 0x02, 0xb9, 0xf1,
-	0x24, 0x2d, 0x09, 0x13, 0x99, 0xcb, 0x84, 0xe4, 0xae, 0x92, 0x34, 0x2f, 0x0e, 0x42, 0x2a, 0x37,
-	0xcd, 0x15, 0x97, 0x39, 0x57, 0x2e, 0x13, 0xf9, 0x65, 0x9a, 0x90, 0x83, 0x14, 0x4a, 0xe0, 0x69,
-	0x97, 0x97, 0x9c, 0xe8, 0x2c, 0xe9, 0xb2, 0x1f, 0x16, 0x4f, 0x70, 0x4c, 0x64, 0x99, 0xc8, 0xdd,
-	0x82, 0xcb, 0x94, 0xee, 0x5d, 0x55, 0x1e, 0xf8, 0xc5, 0x36, 0xe3, 0x45, 0x41, 0x13, 0xde, 0x00,
-	0xe7, 0x77, 0x06, 0xbc, 0x8f, 0x3b, 0x90, 0x5f, 0xaf, 0xc2, 0xbf, 0xc0, 0xae, 0x9b, 0x4c, 0xec,
-	0x27, 0xc6, 0xcc, 0x70, 0xde, 0x79, 0x0b, 0x72, 0x72, 0x2f, 0xd1, 0x84, 0xa0, 0x9d, 0x0b, 0x35,
-	0x01, 0x2f, 0xc1, 0x2e, 0xb8, 0x52, 0x69, 0x9e, 0x14, 0x13, 0x73, 0x66, 0x38, 0x03, 0xef, 0xcb,
-	0x31, 0xad, 0x51, 0x24, 0x8d, 0x22, 0x89, 0x2b, 0xc5, 0x75, 0x63, 0x18, 0xea, 0xb9, 0xf9, 0x83,
-	0x09, 0xc3, 0x48, 0x49, 0x4e, 0xb3, 0x17, 0x51, 0xfc, 0x0f, 0x58, 0x4f, 0x6c, 0x8f, 0x64, 0x2d,
-	0x67, 0xe0, 0x91, 0x73, 0xb9, 0x8d, 0x59, 0x38, 0xd6, 0x99, 0xa8, 0x05, 0xe1, 0xcf, 0x30, 0x2a,
-	0x38, 0xbb, 0x96, 0xa9, 0x2a, 0xb7, 0xd5, 0x1b, 0x4c, 0xac, 0x99, 0xe1, 0xf4, 0xc3, 0x61, 0xf7,
-	0xb1, 0xfa, 0x69, 0x1c, 0xc1, 0x58, 0x87, 0xb4, 0x42, 0xaf, 0x56, 0x38, 0xf7, 0x5e, 0xa8, 0x03,
-	0x74, 0x9b, 0xe7, 0x1f, 0x61, 0x10, 0x48, 0x71, 0x5b, 0xb6, 0x57, 0x43, 0x60, 0x29, 0x9a, 0xd4,
-	0x07, 0xeb, 0x87, 0x55, 0xf9, 0x75, 0x03, 0xe3, 0x67, 0x87, 0xc1, 0x6f, 0xc1, 0x8a, 0xfd, 0x00,
-	0xbd, 0xaa, 0x8a, 0x3f, 0xab, 0x00, 0x19, 0xd8, 0x86, 0xde, 0xfa, 0xa7, 0x1f, 0x20, 0x13, 0x8f,
-	0xa0, 0xff, 0x8f, 0xef, 0x22, 0xc1, 0xae, 0xb8, 0x42, 0x56, 0xd5, 0xf8, 0x1e, 0xc7, 0x01, 0xea,
-	0x61, 0x04, 0xc3, 0x95, 0xc8, 0x68, 0x9a, 0xb7, 0xbd, 0xd7, 0xcb, 0xdf, 0xf0, 0x89, 0x89, 0xec,
-	0xf4, 0xf9, 0x02, 0x63, 0x63, 0x77, 0xf5, 0xbd, 0x39, 0xfd, 0xeb, 0x85, 0xb4, 0x24, 0x7e, 0x95,
-	0xd5, 0x5a, 0xe4, 0x47, 0xdb, 0xdf, 0xbd, 0xa9, 0x1f, 0xec, 0xdb, 0x63, 0x00, 0x00, 0x00, 0xff,
-	0xff, 0xa2, 0xdf, 0xde, 0xa4, 0x35, 0x03, 0x00, 0x00,
+	proto.RegisterFile("v2ray.com/core/transport/internet/config.proto", fileDescriptor_config_59931ebeb80dc13e)
+}
+
+var fileDescriptor_config_59931ebeb80dc13e = []byte{
+	// 419 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xa4, 0x91, 0xd1, 0x8a, 0x13, 0x31,
+	0x14, 0x86, 0xcd, 0x4c, 0x57, 0xdb, 0xd3, 0xae, 0xa6, 0xb9, 0x2a, 0xc2, 0x62, 0xad, 0x20, 0xc5,
+	0x8b, 0xcc, 0x32, 0xbe, 0x41, 0xbb, 0x17, 0x8a, 0xae, 0x86, 0xe9, 0xa8, 0xb0, 0x20, 0x25, 0x1b,
+	0x63, 0x19, 0xdc, 0x24, 0x25, 0x13, 0xc5, 0x79, 0x25, 0x9f, 0xc4, 0xa7, 0xf0, 0x59, 0x24, 0x33,
+	0x93, 0xb0, 0xa8, 0x94, 0x82, 0x77, 0x87, 0x9c, 0x3f, 0xff, 0x39, 0xdf, 0x7f, 0x80, 0x7e, 0xcb,
+	0x2d, 0x6f, 0xa8, 0x30, 0x2a, 0x13, 0xc6, 0xca, 0xcc, 0x59, 0xae, 0xeb, 0xbd, 0xb1, 0x2e, 0xab,
+	0xb4, 0x93, 0x56, 0x4b, 0x97, 0x09, 0xa3, 0x3f, 0x57, 0x3b, 0xba, 0xb7, 0xc6, 0x19, 0x72, 0x16,
+	0xf4, 0x56, 0xd2, 0xa8, 0xa5, 0x41, 0xfb, 0xf0, 0xfc, 0x0f, 0x3b, 0x61, 0x94, 0x32, 0x3a, 0xab,
+	0xa5, 0xad, 0xf8, 0x4d, 0xe6, 0x9a, 0xbd, 0xfc, 0xb4, 0x55, 0xb2, 0xae, 0xf9, 0x4e, 0x76, 0x86,
+	0x8b, 0x9f, 0x08, 0x1e, 0x94, 0xc1, 0x68, 0xdd, 0x8e, 0x22, 0xaf, 0x61, 0xd8, 0x36, 0x85, 0xb9,
+	0x99, 0xa1, 0x39, 0x5a, 0xde, 0xcf, 0xcf, 0xe9, 0xc1, 0xb9, 0x34, 0x3a, 0xb0, 0xfe, 0x5f, 0x11,
+	0x1d, 0xc8, 0x13, 0x38, 0x0d, 0xf5, 0x56, 0x73, 0x25, 0x67, 0xe9, 0x1c, 0x2d, 0x47, 0xc5, 0x24,
+	0x3c, 0xbe, 0xe1, 0x4a, 0x92, 0x15, 0x0c, 0x6b, 0xe9, 0x5c, 0xa5, 0x77, 0xf5, 0x2c, 0x99, 0xa3,
+	0xe5, 0x38, 0x7f, 0x7a, 0x7b, 0x64, 0xc7, 0x41, 0x3b, 0x0e, 0x5a, 0x7a, 0x8e, 0xcb, 0x0e, 0xa3,
+	0x88, 0xff, 0x16, 0xbf, 0x12, 0x98, 0x6c, 0x9c, 0x95, 0x5c, 0xf5, 0x1c, 0xec, 0xff, 0x39, 0x56,
+	0xc9, 0x0c, 0x1d, 0x62, 0x39, 0xf9, 0x07, 0xcb, 0x47, 0x20, 0xd1, 0x7a, 0x7b, 0x8b, 0x2a, 0x5d,
+	0x8e, 0x73, 0x7a, 0xec, 0x02, 0x1d, 0x42, 0x31, 0x8d, 0x9a, 0x4d, 0x6f, 0xe4, 0x77, 0xa8, 0xa5,
+	0xf8, 0x6a, 0x2b, 0xd7, 0x6c, 0xfd, 0x45, 0x43, 0x9e, 0xe1, 0xd1, 0xa7, 0x43, 0x36, 0x30, 0x8d,
+	0xa2, 0xb8, 0xc2, 0xa0, 0x5d, 0xe1, 0xd8, 0x60, 0x71, 0x30, 0x08, 0x93, 0x17, 0x8f, 0x60, 0xcc,
+	0xac, 0xf9, 0xde, 0xf4, 0xf1, 0x62, 0x48, 0x1d, 0xdf, 0xb5, 0xc9, 0x8e, 0x0a, 0x5f, 0x3e, 0xbb,
+	0x82, 0xe9, 0x5f, 0x09, 0x92, 0x7b, 0x90, 0x96, 0x6b, 0x86, 0xef, 0xf8, 0xe2, 0xdd, 0x05, 0xc3,
+	0x88, 0x0c, 0x61, 0x70, 0xf9, 0x6a, 0xcd, 0x70, 0x42, 0x4e, 0x61, 0xf4, 0x41, 0x5e, 0x6f, 0x8c,
+	0xf8, 0x22, 0x1d, 0x4e, 0x7d, 0xe3, 0x45, 0x59, 0x32, 0x3c, 0x20, 0x18, 0x26, 0x17, 0x46, 0xf1,
+	0x4a, 0xf7, 0xbd, 0x93, 0xd5, 0x5b, 0x78, 0x2c, 0x8c, 0x3a, 0x1c, 0x1f, 0x43, 0x57, 0xc3, 0x50,
+	0xff, 0x48, 0xce, 0xde, 0xe7, 0x05, 0x6f, 0xe8, 0xda, 0x6b, 0xe3, 0x5a, 0xf4, 0x65, 0xdf, 0xbf,
+	0xbe, 0xdb, 0x1e, 0xed, 0xf9, 0xef, 0x00, 0x00, 0x00, 0xff, 0xff, 0x1c, 0x47, 0x39, 0x56, 0x83,
+	0x03, 0x00, 0x00,
 }
diff --git a/transport/internet/config.proto b/transport/internet/config.proto
index 7e7625c1..a1bad05f 100644
--- a/transport/internet/config.proto
+++ b/transport/internet/config.proto
@@ -19,15 +19,22 @@ enum TransportProtocol {
 
 message TransportConfig {
   // Type of network that this settings supports.
+  // Deprecated. Use the string form below.
   TransportProtocol protocol = 1;
 
+  // Type of network that this settings supports.
+  string protocol_name = 3;
+
   // Specific settings. Must be of the transports.
   v2ray.core.common.serial.TypedMessage settings = 2;
 }
 
 message StreamConfig {
+  // Effective network. Deprecated. Use the string form below.
+  TransportProtocol protocol = 1 [deprecated = true];
+
   // Effective network.
-  TransportProtocol protocol = 1;
+  string protocol_name = 5;
 
   repeated TransportConfig transport_settings = 2;
 
diff --git a/transport/internet/dialer.go b/transport/internet/dialer.go
index e39f8f20..d365f7d8 100644
--- a/transport/internet/dialer.go
+++ b/transport/internet/dialer.go
@@ -9,10 +9,10 @@ import (
 type Dialer func(ctx context.Context, dest net.Destination) (Connection, error)
 
 var (
-	transportDialerCache = make(map[TransportProtocol]Dialer)
+	transportDialerCache = make(map[string]Dialer)
 )
 
-func RegisterTransportDialer(protocol TransportProtocol, dialer Dialer) error {
+func RegisterTransportDialer(protocol string, dialer Dialer) error {
 	if _, found := transportDialerCache[protocol]; found {
 		return newError(protocol, " dialer already registered").AtError()
 	}
@@ -44,7 +44,7 @@ func Dial(ctx context.Context, dest net.Destination) (Connection, error) {
 		return dialer(ctx, dest)
 	}
 
-	udpDialer := transportDialerCache[TransportProtocol_UDP]
+	udpDialer := transportDialerCache["udp"]
 	if udpDialer == nil {
 		return nil, newError("UDP dialer not registered").AtError()
 	}
diff --git a/transport/internet/domainsocket/config.go b/transport/internet/domainsocket/config.go
index ae8cfbcc..220dfe08 100644
--- a/transport/internet/domainsocket/config.go
+++ b/transport/internet/domainsocket/config.go
@@ -6,6 +6,8 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
+const protocolName = "domainsocket"
+
 func (c *Config) GetUnixAddr() (*net.UnixAddr, error) {
 	path := c.Path
 	if len(path) == 0 {
@@ -21,7 +23,7 @@ func (c *Config) GetUnixAddr() (*net.UnixAddr, error) {
 }
 
 func init() {
-	common.Must(internet.RegisterProtocolConfigCreator(internet.TransportProtocol_DomainSocket, func() interface{} {
+	common.Must(internet.RegisterProtocolConfigCreatorByName(protocolName, func() interface{} {
 		return new(Config)
 	}))
 }
diff --git a/transport/internet/domainsocket/dial.go b/transport/internet/domainsocket/dial.go
index fe1aeb29..c0db02c0 100644
--- a/transport/internet/domainsocket/dial.go
+++ b/transport/internet/domainsocket/dial.go
@@ -43,5 +43,5 @@ func Dial(ctx context.Context, dest net.Destination) (internet.Connection, error
 }
 
 func init() {
-	common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_DomainSocket, Dial))
+	common.Must(internet.RegisterTransportDialer(protocolName, Dial))
 }
diff --git a/transport/internet/domainsocket/listener.go b/transport/internet/domainsocket/listener.go
index 07cbacaa..e02e3a29 100644
--- a/transport/internet/domainsocket/listener.go
+++ b/transport/internet/domainsocket/listener.go
@@ -127,5 +127,5 @@ func (fl *fileLocker) Release() {
 }
 
 func init() {
-	common.Must(internet.RegisterTransportListener(internet.TransportProtocol_DomainSocket, Listen))
+	common.Must(internet.RegisterTransportListener(protocolName, Listen))
 }
diff --git a/transport/internet/http/config.go b/transport/internet/http/config.go
index a746b595..814e96be 100644
--- a/transport/internet/http/config.go
+++ b/transport/internet/http/config.go
@@ -6,6 +6,8 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
+const protocolName = "http"
+
 func (c *Config) getHosts() []string {
 	if len(c.Host) == 0 {
 		return []string{"www.example.com"}
@@ -39,7 +41,7 @@ func (c *Config) getNormalizedPath() string {
 }
 
 func init() {
-	common.Must(internet.RegisterProtocolConfigCreator(internet.TransportProtocol_HTTP, func() interface{} {
+	common.Must(internet.RegisterProtocolConfigCreatorByName(protocolName, func() interface{} {
 		return new(Config)
 	}))
 }
diff --git a/transport/internet/http/dialer.go b/transport/internet/http/dialer.go
index ae8753b4..5ee9f402 100644
--- a/transport/internet/http/dialer.go
+++ b/transport/internet/http/dialer.go
@@ -121,5 +121,5 @@ func Dial(ctx context.Context, dest net.Destination) (internet.Connection, error
 }
 
 func init() {
-	common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_HTTP, Dial))
+	common.Must(internet.RegisterTransportDialer(protocolName, Dial))
 }
diff --git a/transport/internet/http/hub.go b/transport/internet/http/hub.go
index 29fc21ae..ba84cac8 100644
--- a/transport/internet/http/hub.go
+++ b/transport/internet/http/hub.go
@@ -126,5 +126,5 @@ func Listen(ctx context.Context, address net.Address, port net.Port, handler int
 }
 
 func init() {
-	common.Must(internet.RegisterTransportListener(internet.TransportProtocol_HTTP, Listen))
+	common.Must(internet.RegisterTransportListener(protocolName, Listen))
 }
diff --git a/transport/internet/kcp/config.go b/transport/internet/kcp/config.go
index 7b5f2fa2..02f03d2e 100644
--- a/transport/internet/kcp/config.go
+++ b/transport/internet/kcp/config.go
@@ -7,6 +7,8 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
+const protocolName = "mkcp"
+
 // GetMTUValue returns the value of MTU settings.
 func (c *Config) GetMTUValue() uint32 {
 	if c == nil || c.Mtu == nil {
@@ -97,7 +99,7 @@ func (c *Config) GetReceivingBufferSize() uint32 {
 }
 
 func init() {
-	common.Must(internet.RegisterProtocolConfigCreator(internet.TransportProtocol_MKCP, func() interface{} {
+	common.Must(internet.RegisterProtocolConfigCreatorByName(protocolName, func() interface{} {
 		return new(Config)
 	}))
 }
diff --git a/transport/internet/kcp/dialer.go b/transport/internet/kcp/dialer.go
index e44e6b1b..496b46c0 100644
--- a/transport/internet/kcp/dialer.go
+++ b/transport/internet/kcp/dialer.go
@@ -95,5 +95,5 @@ func DialKCP(ctx context.Context, dest net.Destination) (internet.Connection, er
 }
 
 func init() {
-	common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_MKCP, DialKCP))
+	common.Must(internet.RegisterTransportDialer(protocolName, DialKCP))
 }
diff --git a/transport/internet/kcp/listener.go b/transport/internet/kcp/listener.go
index 00ea56f2..22653341 100644
--- a/transport/internet/kcp/listener.go
+++ b/transport/internet/kcp/listener.go
@@ -187,5 +187,5 @@ func ListenKCP(ctx context.Context, address net.Address, port net.Port, addConn
 }
 
 func init() {
-	common.Must(internet.RegisterTransportListener(internet.TransportProtocol_MKCP, ListenKCP))
+	common.Must(internet.RegisterTransportListener(protocolName, ListenKCP))
 }
diff --git a/transport/internet/tcp/config.go b/transport/internet/tcp/config.go
index cd8cc0f7..d5e51440 100644
--- a/transport/internet/tcp/config.go
+++ b/transport/internet/tcp/config.go
@@ -5,8 +5,10 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
+const protocolName = "tcp"
+
 func init() {
-	common.Must(internet.RegisterProtocolConfigCreator(internet.TransportProtocol_TCP, func() interface{} {
+	common.Must(internet.RegisterProtocolConfigCreatorByName(protocolName, func() interface{} {
 		return new(Config)
 	}))
 }
diff --git a/transport/internet/tcp/dialer.go b/transport/internet/tcp/dialer.go
index d4f1a9fc..307f0d15 100644
--- a/transport/internet/tcp/dialer.go
+++ b/transport/internet/tcp/dialer.go
@@ -48,5 +48,5 @@ func Dial(ctx context.Context, dest net.Destination) (internet.Connection, error
 }
 
 func init() {
-	common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_TCP, Dial))
+	common.Must(internet.RegisterTransportDialer(protocolName, Dial))
 }
diff --git a/transport/internet/tcp/hub.go b/transport/internet/tcp/hub.go
index 7b580928..5b3fcb05 100644
--- a/transport/internet/tcp/hub.go
+++ b/transport/internet/tcp/hub.go
@@ -92,5 +92,5 @@ func (v *Listener) Close() error {
 }
 
 func init() {
-	common.Must(internet.RegisterTransportListener(internet.TransportProtocol_TCP, ListenTCP))
+	common.Must(internet.RegisterTransportListener(protocolName, ListenTCP))
 }
diff --git a/transport/internet/tcp_hub.go b/transport/internet/tcp_hub.go
index 081b04aa..6335dc1a 100644
--- a/transport/internet/tcp_hub.go
+++ b/transport/internet/tcp_hub.go
@@ -7,10 +7,10 @@ import (
 )
 
 var (
-	transportListenerCache = make(map[TransportProtocol]ListenFunc)
+	transportListenerCache = make(map[string]ListenFunc)
 )
 
-func RegisterTransportListener(protocol TransportProtocol, listener ListenFunc) error {
+func RegisterTransportListener(protocol string, listener ListenFunc) error {
 	if _, found := transportListenerCache[protocol]; found {
 		return newError(protocol, " listener already registered.").AtError()
 	}
diff --git a/transport/internet/udp/dialer.go b/transport/internet/udp/dialer.go
index 8b4f56d8..0e6d7e53 100644
--- a/transport/internet/udp/dialer.go
+++ b/transport/internet/udp/dialer.go
@@ -9,7 +9,7 @@ import (
 )
 
 func init() {
-	common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_UDP,
+	common.Must(internet.RegisterTransportDialer(protocolName,
 		func(ctx context.Context, dest net.Destination) (internet.Connection, error) {
 			src := internet.DialerSourceFromContext(ctx)
 			conn, err := internet.DialSystem(ctx, src, dest)
diff --git a/transport/internet/udp/udp.go b/transport/internet/udp/udp.go
index 977d8704..250ea679 100644
--- a/transport/internet/udp/udp.go
+++ b/transport/internet/udp/udp.go
@@ -1,3 +1,5 @@
 package udp
 
 //go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg udp -path Transport,Internet,UDP
+
+const protocolName = "udp"
diff --git a/transport/internet/websocket/config.go b/transport/internet/websocket/config.go
index ef55adda..727a2486 100644
--- a/transport/internet/websocket/config.go
+++ b/transport/internet/websocket/config.go
@@ -7,6 +7,8 @@ import (
 	"v2ray.com/core/transport/internet"
 )
 
+const protocolName = "websocket"
+
 func (c *Config) GetNormalizedPath() string {
 	path := c.Path
 	if len(path) == 0 {
@@ -27,7 +29,7 @@ func (c *Config) GetRequestHeader() http.Header {
 }
 
 func init() {
-	common.Must(internet.RegisterProtocolConfigCreator(internet.TransportProtocol_WebSocket, func() interface{} {
+	common.Must(internet.RegisterProtocolConfigCreatorByName(protocolName, func() interface{} {
 		return new(Config)
 	}))
 }
diff --git a/transport/internet/websocket/dialer.go b/transport/internet/websocket/dialer.go
index 63927d9a..1cbe0010 100644
--- a/transport/internet/websocket/dialer.go
+++ b/transport/internet/websocket/dialer.go
@@ -25,7 +25,7 @@ func Dial(ctx context.Context, dest net.Destination) (internet.Connection, error
 }
 
 func init() {
-	common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_WebSocket, Dial))
+	common.Must(internet.RegisterTransportDialer(protocolName, Dial))
 }
 
 func dialWebsocket(ctx context.Context, dest net.Destination) (net.Conn, error) {
diff --git a/transport/internet/websocket/hub.go b/transport/internet/websocket/hub.go
index e8cb9393..85ba0391 100644
--- a/transport/internet/websocket/hub.go
+++ b/transport/internet/websocket/hub.go
@@ -115,5 +115,5 @@ func (ln *Listener) Close() error {
 }
 
 func init() {
-	common.Must(internet.RegisterTransportListener(internet.TransportProtocol_WebSocket, ListenWS))
+	common.Must(internet.RegisterTransportListener(protocolName, ListenWS))
 }